Safety device for presses.



R B. BENEAMIN,

SAFETY DEVICE FOR PRESSES.

APPLICATlOM FILED JULY 3,1913.

Patented Jan. 11, 1916.

the like.

TED STATES PAENT FFCE.

REUBEN B. BENJAMIN, OF CHICAGO, ILLINOIS, ASSIGNOR TC! BENJAMIN ELECTRIC MANUFACTURING COMPANY, OF CHICAGO. ILLINOIS, A GORPORATIGN 0F ILLINOIS.

SAFETY DEVICE FOR PRESSES.

Application filed July 3, 1913.

To all (U/LOUD it may concern lie it known that I, REUBEN B. BEN JA- MIN, a citizen of the United States, residin at. Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Safety Devices for Presses, of which the following is a full, clear, concise, and exact description, reference beinghad to the accon'ipanying drawing, forming a part of this specification.

My invention, relates to improvements in protective means for presses, and particularly to punch and stamping presses, and

It has for its object to provide a barrier which is arranged to be dropped into position during the operation of the press and prevent the operator from placing his hands in a dangerous position, the barrier be ng arranged to prevent the press from being tripped when raised so that the hands may be inserted in the press.

For the purpose of illustrating my invention I have shown one embodiment there of in the accompanying drawings, in which- Figure I is a side elevation of av press having one embodiment of my safety mechanism attached thereto; and, Fig. 2 1s a front plan view showing the construction of the barrier.

In the embodiment illustrated, the press I may be of the usual construction having a reciprocating ram which is operated in the usual manner and which is provided wlth a tripping mechanism 2 of the usual construction. This tripping mechanism connected with a pivoted lever 3 by a rod 4. pivoted lever is also pivoted by a rod 5 with a foot lever 3 arranged on the right hand side of the press, the construction being such that when the lever is depressed by the operators foot the press will be tripped.

On a portion of the frame of the pressl mount a framework 7, whichis provided with slots 8 through which the ,securing bolts 9 are adapted to be passed, whereby the framework may be adjusted vertically, and at the lower end of this frame I provide a shaft 10 on which is rigidly mounted a barrier 11, which barrier is adapted to drop down on the press in a position immedi ately above the table 12 thereof and, in front of the,operating,mechanism of, the press. This barrier is slotted as at 13, so

Specification of Letters Eatent.

Patented Jan. 11, 1916.

Serial No. 777,372.

that the operator may see therethrough, or may take any form of a visual barrier, such, for instance, as a screen or a piece of glass or any other structure. On the left-hand side of the shaft 10 I provide a crank arm 1% which at its outer end is connected by a rod 15 with a. lever 16 pivoted at I? to the press. By depiessing the outer end of the lever 16 the rod 15 will be raised, thereby rocking the barrier inwardly and toward a horizontal position. The barrier is connected by a rod 18 with a pivoted stop 19, arranged when the barrier is in its raised or horizontal position to be swung in the path of the lever 3 so that the tripping mechanism of the press cannot be operated.

In operation, the operator by his left foot first depresses the lever 16, whereby the bar rier 11 is swung inwardly and upwardly to permit the work to be inserted in the press. At the same time the stop 19 is swung in the path of the lever 13 so that the press cannot be tripped. When the operator has placed the work in the press and removed his hands he then releases the lever 16, which permits the barrier to swing back to normal position and in a position to prevent the hands from being inserted in the press, and by depress ing the lever 23 with his left foot trips the press. It will be noted that as long as the barrier is raised for the insertion of the hands in the press the press cannot be tripped, and it will also be noted that the barrier cannot be permitted to fall back into its normal position until the hands are removed.

In some instances I may dispense entirely with the lever for operating the barrier and depend merely upon the operator raising the same by pushing his hands against the bar- 'rier when inserting the work in position.

This operation, however. would throw the stop 19 into the path of the lever 53 and prevent the tripping of the press as long as the barrier wasu'aised.

I-Iavingthus described my invention, what I claim as new and desireto secure by Letters Patent is- 1. In a safety device for presses, the combination with a movable member for tripping the press, of a barrier pivoted in front of the operating mechanism of the press am arranged when in closed position to prevent the o aerator from insertin his hands in the operating mechanism of the press and to be swung on its pivot to a substantially -horizontal position to permit the insertion of the work in the mechanism of thegp ess, and means connected with said barrier arranged to be movedinaa-locking position to prevent the tripping of the press when theharrier is swung to open position.

2. In a safety device for presses, the combination with a movable member for tripping the press, of a barrier pivoted above the table of the pressiand arranged to hang in va substantially vertical position in front of the operating mechanism of the press and to be swung on its pivot toward a horizontal for the press, of-operating means for said tripping member, a barrier pivoted in front of the operating mechanism of the press and arranged to be swung to a substantially horizontal position to permit the insertion of the work in the press, and a stop connected with said barrierand arranged to be moved into position to prevent said operating means from moving said movable memher when the barrier is swung to substantially horizontal position. i 4

4; In a safety device for presses, the combination with a movable member 'for trip ping the press, of a barrier pivoted in front of the operating mechanism of the press and arranged when in closed position to prevent the insertion of thehands in the mechanism of the press, said barrierbeing arranged to be swung to a substantially horizontalposition to permit the insertion of the Work in the mechanism of'the press, and means connected with said barrier arranged when the barrier is swung to horizontal position to be thrown into locking position to prevent the tripping of the press, said means remaining in looking position until the barrier is returned to full closed position.

5. In a safety device for presses, the combination with a spring-returned tripping mechanism, of a pivoted arm, a rod connecting said tripping mechanism with said aim, means for depressing said' arm, a stop, a barrier pivoted above said press and arranged to be swung toward horizontal position to permit the work to be inserted in the operating mechanism of said press, 'and means connecting said barrier with said stop for moving said stop into the path of said pivoted arm when the barrier is swung to permit the insertion of the work in the press.

6. In a safety device for presses, the com bination with a tripping mechanism for the press, to a pivoted arm, means connecting ranged when in closed position to extend substantially at right angles to the table of the press and arranged .to be swung on it's pivot to a substantially. horizontal position to permit the work to be inserted in the opcrating mechanism of the press, a stop, and

means connecting said stop with said barrier and arranged to move the'stop in the path of said pivoted arm to prevent said arm from moving until the barrier is moved to its substantially vertical position.

7. In amachine having a part movable in a definite path. means for controlling the movement of movable part, in combina- 1 tion w th-a barrler mqvable from a substantially vertical toward ahorizontal position,

8. In a machine having a part movable in a definite path, means for controlling the movement of said movable part, in combination with a barrier movable from a substantially vertical toward a horizontal position,

- which in vertical position hinders theop-z.

erator from placing his-hands in the path of,

said part,-mean s for normally holding barrier in thisposition; andmeansfor; controlling said first aeontrolling." means conk trolled by said harried-fv 9 'A h ne ha g w s mevablefin definite path and having means forconti oL ling the movement of said movable-part, in combination witha' barrier movable from: a A substantiallyf vertical; toward a a horizontal a position, which in vertical position hinders the operator from placing his hands in the path of said part, means for normally'hold ing said barrierv in this position, and stop means for controlling said first controlling, means controlled by 'said'barrier'.

10. Amachine having apart movable in a definite path, in combination witha barrier movable from a substantially vertical toward a horizontal position, which in vertical position hinders the operator from placing his hands'in said path, means for nor-.

mally holding said barrier in said position, and means whereby movement of said bar..-

rier from said position controls the move-' ment of said part. I I

11. A machine ha'vinga part movable in a definite path, in combination with-a -bar rier movable from a substantially vertical toward a horizontal position, which in vertical position hinders the operator from placing his hands in said path, means for normally holding said barrier in said position, and meahs whereby movement of said barrier from said position restricts the movement of said part.

12. A machine having a part movable in a substantially vertical path, a pivotally mounted guard adjacent said part, means for normally holding said guard in substantially vertical position, means for controlling the movement of said part, a stop member movable into and out of the path of said controlling means, and a link directly connecting said guard and said stop member.

13. A machine having a part movable in a substantially vertical path, a pivotally mounted guard adjacent said part, means for normally holding said guard in substantially vertical position, means for controlling the movement of said part, a pivoted stop member movable into and out of the 15 path of said controlling means, and a link directly connecting said guard and said stop member.

In Witness whereof, I have hereunto subscribed my name in the presence of tWo wit- 20 

